. >> congresswoman gabrielle giffords is expected to testify at the first congressional hearing since the president launched his gun control campaign. the head of the national rifle association is also scheduled to testify before the senate judiciary committee today as is gabrielle giffords' husband, retired international mark kelly. the c.e.o. says law abiding gun owners will not accept blame for sick killers. all are urged to attend the hearing. >> c.h.p. investigators are closer to identifying the drives involved in a dangerous sideshow in the middle of interstate 880 over the weekend at 4:00 p.m. on saturday involving half a dozen vehicles near the oakland colisieum. an anonymous caller who gave crucial information to the c.h.p. spoke exclusively with abc7 news. he says he saw the postings on facebook implicating the drivers. >> they were posted on the internet and someone posted it and i saw it, a comment, saying that they knew someone in the video. >> the videos were uploaded to youtube so it was easy for the detectives to track down the drives. c.h.p. says it is only a matter o